AMD APUs typically feature multiple PCIe lanes for connectivity and performance.
AMD APUs typically feature multiple PCIe lanes for connectivity and performance.
From what I understand, the 5700G features 20 dedicated Gen3 lanes for devices and four for storage, with four lanes reserved for the chipset. The 8700G seems to have a slightly different layout, though some might attribute it to board design choices rather than hardware limitations.
The 5700G offered the same PCIe lane count as typical Ryzen 3000/5000 series processors, which is 20+4 (20 general-purpose lanes plus 4 dedicated to the chipset). The confusion about AM4 having 24 or 20 lanes comes from considering chipset lanes versus PCIe lanes. Personally, I lean toward the 20-lane view since those four slots are mainly for the chipset and don’t provide much practical use. Similar to how an LGA 1700 CPU isn’t really notable for its 8 DMI links, which are more PCIe than dedicated slots, the focus should be on what the motherboard actually does with the available lanes. Real-world usage depends on the board’s configuration—some boards treat those lanes as x4 PCIe or NVMe, while others leave them flexible. Ultimately, the debate over total PCIe slots isn’t crucial; a CPU can support many lanes, but only the wired ones matter. The motherboard decides how effectively they’re used.